diff --git a/include/boost/config.hpp b/include/boost/config.hpp
index 2edf5c49..15e64d57 100644
--- a/include/boost/config.hpp
+++ b/include/boost/config.hpp
@@ -145,6 +145,11 @@
 
 //  BOOST_NO_LIMITS: The C++ implementation does not provide the <limits> header.
 
+//  BOOST_NO_INTRINSIC_WCHAR_T: The C++ implementation does not provide wchar_t,
+//  or it is really a synonym for another integral type. Use this symbol to
+//  decide whether it is appropriate to explicitly specialize a template on
+//  wchar_t if there is already a specialization for other integer types.
+
 
 //  Compilers are listed in alphabetic order (except VC++ last - see below)---//
 
@@ -241,6 +246,8 @@
 #     define BOOST_NO_INCLASS_MEMBER_INITIALIZATION
 #     define BOOST_NO_PRIVATE_IN_AGGREGATE
 
+#     define BOOST_NO_INTRINSIC_WCHAR_T
+
 //    VC++ 6.0 has member templates but they have numerous problems including
 //    cases of silent failure, so for safety we define:
 #     define BOOST_NO_MEMBER_TEMPLATES